Service Continuity in Wireless Networks via Dual Core Network Connections

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Solution Overview

Problem

Wireless communication systems face challenges in maintaining service continuity when user equipment (UE) switches between public land mobile networks (PLMN) and standalone non-public networks (SNPN), particularly in ensuring high service quality and coverage, especially during mobility scenarios.

Innovation Solution

The method involves establishing connections between a wireless terminal and both core networks of PLMN and SNPN, transmitting release and paging messages to manage handovers, and using untrusted access for non-3GPP networks to maintain service continuity by setting up PDU sessions and handling handovers between different network types.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the UE switches between PLMN and SNPN networks to maintain service continuity, then service availability is improved, but handover latency and service interruption time increase

Engineering Contradiction:

Improveservice continuityVSAvoidhandover latency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The network pre-configures multiple PDU sessions corresponding to different networks (PLMN and SNPN) before handover is needed. When service continuity is required, the UE can immediately switch to a pre-established PDU session in the target network, avoiding the time-consuming process of establishing new connections during handover.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent maintains multiple active PDU sessions simultaneously across different networks. During handover, the system seamlessly transitions data transmission from one PDU session to another without interrupting the underlying service flow, ensuring continuous service delivery while minimizing perceptible latency.

Inventive Principle:

Principle #20Continuity of useful action

2Adaptability or versatility

If the UE maintains connections to multiple core networks simultaneously, then service quality and coverage are improved, but device complexity and resource consumption increase

Engineering Contradiction:

Improvenetwork coverageVSAvoidconnection management

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The UE is designed with multi-functional capability to simultaneously maintain connections to multiple core networks (PLMN and SNPN). The device can actively manage multiple PDU sessions across different network types, selecting the appropriate connection based on service requirements, coverage conditions, and network availability, thereby achieving universal access without proportionally increasing complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS20230397059A1Method for service continuity

Publication Date: 2023.12.07 ZTE CORP

AI summary

A wireless communication method for use in a first wireless network node of a first network is disclosed. The method comprises establishing, for at least one service, connections between a wireless terminal and a first core network of the first network and between the wireless terminal and a second core network of one of at least one second network, wherein the first network is one of a public land mobile network or a non-public network and the at least one second network is another one of the public land mobile network or the non-public network, and transmitting, to the wireless terminal, a release message of releasing the wireless terminal to an inactive mode, transmitting, to the wireless terminal, a paging message associated with a paging core network, wherein the paging core network comprises at least one of the first core network or the second core network.